OIMC-99-1: Published: Nov 1, 1998. Publicly Released: Nov 1, 1998.

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GAO published the fourth edition of the GAO Thesaurus which lists more than 2,500 terms used to index GAO documents and retrieve information from the GAO documents data base. The thesaurus is divided into two parts: (1) an alphabetical thesaurus of subject terms; and (2) a keyword out of context index.